From owner-freebsd-hackers Thu Mar 5 12:09:41 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA11419 for freebsd-hackers-outgoing; Thu, 5 Mar 1998 12:09:41 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from sendero.simon-shapiro.org (sendero-fxp0.Simon-Shapiro.ORG [206.190.148.34]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id MAA11353 for ; Thu, 5 Mar 1998 12:09:24 -0800 (PST) (envelope-from shimon@sendero-fxp0.simon-shapiro.org) Received: (qmail 707 invoked by uid 1000); 5 Mar 1998 20:15:21 -0000 Message-ID: X-Mailer: XFMail 1.3-alpha-021598 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: Date: Thu, 05 Mar 1998 12:15:21 -0800 (PST) Reply-To: shimon@simon-shapiro.org Organization: The Simon Shapiro Foundation From: Simon Shapiro To: Duncan Barclay Subject: Re: SCSI Bus redundancy... Cc: Wilko Bulte , julian@whistle.com, hackers@FreeBSD.ORG Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 05-Mar-98 Duncan Barclay wrote: ... > Are you sure you guys want to use different phases of a the same feed? > Remember > all two or three phases come into the building from the same sub-station > down > the same pice of cable. Most comman fault is a digger cutting this > cable taking out all three phases or temp. shorts in the > overheads to the sub-station (auto reset ater a couple of minutes; > usually > from wind blowing the cables together). > > You need feeds from seperate sub-stations. And then snow levels the cables from the power plant, or a flood destroys the dam... I recommend 2 separate UPSs for the two inputs. True HA should be on 48VDC, separate packs, separate feeds. Standard Telco stuff. ---------- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message